1 files changed, 89 insertions, 0 deletions
diff --git a/java/com/android/dialer/commandline/impl/Help.java b/java/com/android/dialer/commandline/impl/Help.java
new file mode 100644
index 000000000..d0e008014
--- /dev/null
+++ b/java/com/android/dialer/commandline/impl/Help.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.dialer.commandline.impl;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import com.android.dialer.commandline.Command;
+import com.android.dialer.commandline.CommandLineComponent;
+import com.android.dialer.inject.ApplicationContext;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+import java.util.Map.Entry;
+import java.util.concurrent.ExecutionException;
+import javax.inject.Inject;
+
+/** List available commands */
+public class Help implements Command {
+
+  private final Context context;
+
+  @Inject
+  Help(@ApplicationContext Context context) {
+    this.context = context;
+  }
+
+  @Override
+  public ListenableFuture<String> run(ImmutableList<String> args) {
+    boolean showHidden = args.contains("--showHidden");
+
+    StringBuilder stringBuilder = new StringBuilder();
+    ImmutableMap<String, Command> commands =
+        CommandLineComponent.get(context).commandSupplier().get();
+    stringBuilder
+        .append(runOrThrow(commands.get("version")))
+        .append("\n")
+        .append("\n")
+        .append("usage: <command> [args...]\n")
+        .append("\n")
+        .append("<command>\n");
+
+    for (Entry<String, Command> entry : commands.entrySet()) {
+      String description = entry.getValue().getShortDescription();
+      if (!showHidden && description.startsWith("@hide ")) {
+        continue;
+      }
+      stringBuilder
+          .append("\t")
+          .append(entry.getKey())
+          .append("\t")
+          .append(description)
+          .append("\n");
+    }
+
+    return Futures.immediateFuture(stringBuilder.toString());
+  }
+
+  private static String runOrThrow(Command command) {
+    try {
+      return command.run(ImmutableList.of()).get();
+    } catch (InterruptedException e) {
+      Thread.interrupted();
+      throw new RuntimeException(e);
+    } catch (ExecutionException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @NonNull
+  @Override
+  public String getShortDescription() {
+    return "Print this message";
+  }
+}